/* roulang page: index */
:root {
      --primary-red: #FF4655;
      --deep-purple: #1A1A2E;
      --cyber-blue: #00D2FF;
      --bg-gray: #F4F6F9;
      --white: #FFFFFF;
      --text-dark: #2C3E50;
      --text-muted: #7F8C8D;
      --border-light: rgba(0,0,0,0.04);
      --radius-sm: 8px;
      --radius-lg: 12px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-glow: 0 8px 30px rgba(255,70,85,0.15);
      --shadow-blue: 0 0 0 2px rgba(0,210,255,0.2);
      --spacing-section: 100px;
      --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: var(--font-family);
      background-color: var(--bg-gray);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    
    /* 容器微调 */
    .grid-container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }
    
    /* 板块间距 */
    section {
      padding: var(--spacing-section) 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    
    /* 标题装饰线 */
    .section-title {
      font-weight: 700;
      font-size: 38px;
      color: var(--deep-purple);
      margin-bottom: 1.2rem;
      position: relative;
      display: inline-block;
    }
    .section-title::before {
      content: '';
      display: block;
      width: 50px;
      height: 4px;
      background: var(--primary-red);
      margin-bottom: 0.8rem;
      border-radius: 2px;
    }
    
    /* 按钮 */
    .btn-primary {
      background: var(--primary-red);
      color: white;
      border-radius: 4px;
      padding: 14px 36px;
      font-weight: 600;
      border: none;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 12px rgba(255,70,85,0.25);
    }
    .btn-primary:hover {
      background: #E63946;
      box-shadow: 0 0 20px rgba(255,70,85,0.6);
      color: white;
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-red);
      color: var(--primary-red);
      border-radius: 4px;
      padding: 14px 36px;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-block;
    }
    .btn-outline:hover {
      background: var(--primary-red);
      color: white;
      box-shadow: 0 0 18px rgba(255,70,85,0.5);
    }
    
    /* 卡片基础 */
    .card-custom {
      background: var(--white);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border: 1px solid var(--border-light);
      overflow: hidden;
    }
    .card-custom:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-glow);
      border-color: var(--cyber-blue);
    }
    
    /* 导航 */
    .glass-nav {
      background: rgba(26, 26, 46, 0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 12px 0;
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 99;
      transition: all 0.3s ease;
    }
    .nav-scrolled {
      background: rgba(26, 26, 46, 0.98);
      box-shadow: 0 4px 20px rgba(0,0,0,0.4);
      padding: 8px 0;
    }
    .logo-text {
      font-weight: 800;
      font-size: 24px;
      color: white;
      letter-spacing: 1px;
    }
    .logo-text span {
      color: var(--cyber-blue);
    }
    .nav-link {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      margin: 0 14px;
      transition: 0.2s;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--cyber-blue);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--primary-red);
      border-radius: 2px;
    }
    .nav-cta {
      background: var(--primary-red);
      color: white !important;
      padding: 8px 22px !important;
      border-radius: 4px;
      font-weight: 600;
    }
    .nav-cta:hover {
      background: #E63946;
      box-shadow: 0 0 15px rgba(255,70,85,0.6);
    }
    
    /* 移动菜单 */
    .hamburger {
      color: white;
      font-size: 26px;
    }
    @media (max-width: 1024px) {
      .nav-desktop {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
    }
    @media (min-width: 1025px) {
      .mobile-menu {
        display: none;
      }
      .nav-desktop {
        display: flex;
      }
    }
    
    /* Hero */
    #hero {
      background: radial-gradient(circle at 20% 30%, #1A1A2E, #0A0A0F);
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 80px;
      position: relative;
    }
    .hero-left h1 {
      font-weight: 900;
      font-size: 58px;
      color: white;
      letter-spacing: 2px;
      line-height: 1.2;
    }
    .hero-left p {
      color: #B0BEC5;
      font-size: 20px;
      margin: 24px 0 36px;
    }
    
    /* 亮点网格 */
    .highlight-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 28px 18px;
      border-left: 4px solid var(--primary-red);
      transition: 0.3s;
      box-shadow: var(--shadow-sm);
    }
    .highlight-card i {
      color: var(--cyber-blue);
      font-size: 32px;
      margin-bottom: 16px;
    }
    
    /* 案例瀑布流 */
    .masonry {
      column-count: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
    }
    .masonry-item img {
      width: 100%;
      display: block;
      transition: 0.4s;
    }
    .masonry-item:hover img {
      transform: scale(1.04);
      filter: contrast(1.1);
    }
    
    /* 对比表格 */
    .compare-table th {
      background: var(--deep-purple);
      color: white;
    }
    .highlight-win {
      color: var(--primary-red);
      font-weight: 700;
    }
    
    /* FAQ */
    .accordion-title {
      background: #F4F6F9;
      font-weight: 600;
      font-size: 18px;
      border-radius: 6px;
    }
    .accordion-title i {
      color: var(--primary-red);
      margin-right: 8px;
    }
    
    /* 表单 */
    input, textarea {
      border: 1px solid #DFE6E9;
      border-radius: 4px;
      padding: 12px;
      width: 100%;
      margin-bottom: 16px;
      transition: 0.2s;
    }
    input:focus, textarea:focus {
      border-color: var(--cyber-blue);
      box-shadow: var(--shadow-blue);
      outline: none;
    }
    
    /* 页脚 */
    .footer {
      background: var(--deep-purple);
      color: #B0BEC5;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255,255,255,0.08);
    }
    
    @media (max-width: 1024px) {
      .highlight-grid { grid-template-columns: repeat(2,1fr); }
      .masonry { column-count: 2; }
      .hero-left h1 { font-size: 42px; }
    }
    @media (max-width: 640px) {
      .highlight-grid { grid-template-columns: 1fr; }
      .masonry { column-count: 1; }
      .hero-left h1 { font-size: 36px; }
    }